The short version
Same anatomy, two different philosophies. Nurosym is the spartan single-programme platform with the deepest evidence base. Vagustim is the protocol-rich EU alternative with broader presets at a lower price.
When is Nurosym the right pick?
If you are running structured tVNS self-experiments, want the deepest published evidence base to reference and prefer a deliberately spartan single-programme approach, Nurosym is the right shape. Parasym devices, mostly earlier models, are the most-studied consumer auricular tVNS platform; the trials that name Nurosym itself were mostly null.
When is Vagustim the right pick?
If you are in an EU market and want a wider library of disclosed-parameter presets covering sleep, stress, depression, anxiety and IBS protocols, Vagustim is the right shape. The lower price and the protocol variety are the differentiators; the trade is brand recognition and trial volume.